I thought exactly like you before i got a merge, now our sage have 60-70 people in it per time and i tell you is a whole mess. Until there aren't less than 30 people left you cannot select people from the screen, you have to actually click on them on the map without knowing at all who you are picking. At the point 30 people are left the games are done and there's nothing you can do to reverse the flow. So, in the end, it's exactly how it was before with the only difference that you don't get anymore the advanced runes if not by luck.